Process of directly producing phonogram carriers suitable to be played off



Patented Apr. 15, 1930 UNITED STATES PATENT OFFICE ALFRED CHMIELOWSKI,OF VIENNA, AUSTRIA, ASSIGNOR, BY DIRECT AND MESNE AS- SIGNMENTS, TOSIGMUND KATSCHER, OF VIENNA, AUSTRIA PROCESS OF DIRECTLY PRODUCINGPHONOGRAM CAR BIEBS SUITABLE TO BE PLAYED OFF N0 Drawing. Applicationfiled July 5, 1928, Serial No. 290,685, and in Austria May 23, 192').

This invention relates to a process of di- I'cctly producing phonogrambases or carriers suitableto be played ofl.

The present invention has for its object to produce with the knowntalking machines, adapted for plate-shaped, cylindrical or band-shapedsound records, all audible sound l Waves, such as for instance words,music, singing and so forth, and to immediately reproduce the said soundwaves as often as desired.

According to the present invention a-plate, cylinder or band consistingof gelatine is used as the carrier or base of the sound curves and thelatter are engraved into the surface of the said carrier after thegelatine, preferably at its surface, has been covered with grease or afatty substance in order to preserve the keenness of the producingneedle.

The common sound boxes and guide mechanisms are used when providingthecarrier with sound curves.

After the production is finished the gelatine provided with sound curvesis hardened by means of an alcoholic formaldehyde solution, such as amixture of one part formaldehyde and two parts methyl alcohol, either atonce or after some time, in order to increase its resistance againstmechanical (reproducing needle), chemical or atmospheric influences.

In order to attain reproduction without extraneous noises, the soundgroove now embedded in the surface of the carrier is covered with fat orgrease, whereby'the gelatine surfaces (sound curves) laid bare by theproducing needle are rendered more smooth by the greasy coating, so thatthe reproducing needle is guided smoothly.

A single sound box can beused for producing and reproducing, in whichevent a producing needle (steel needle) and a reproducing needle(glassor sapphire needle) respectively are insertedin the sound box.

By my improved process there can be produced also talking. films withperfect synchronism ifthe soundl. curves are engraved at the border ofthe perforations into the gelatine of the kinematographic film.

The object of the present invention is to produce an original'which canbe played a practically unlimited number of times,where y the knowncomplicated and expensive methods (moulds) are dispensed with and thestrip of gelatine, photographic or moving picture film having a soundgroove cut at the margin thereof.

I claim- 1. A phonogram record comprising a hardened gelatine layerhaving a sound groove 'cut therein.

2. A phonogram record comprising a' surface layer of gelatine having asound groove cut therein.

In testimon whereof I ailix my signature.

A FRED CHMIELOWSKI.

